| 摘要 |
According to an aspect of the present invention, a cryostat includes two separate cooling means, one for reducing the temperature in a cooling chamber ( 2 ) and the other arranged to cool a freezing plate ( 8 ). In one embodiment, there may be a single cooling circuit, with e.g. a single reservoir of refrigerant, but with a separate compressor provided for each of the cooling means i.e. one compressor to control the temperature within the cooling chamber (2) and a separate compressor for the cooling circuit associated with the freezing plate ( 8 ). In accordance with another aspect of the present invention, the freezing plate ( 8 ) includes means for retaining some liquid on the surface of the freezing plate. In an embodiment, these means are provided by a lip ( 12 ). In a further aspect a friction generating means provides resistance to the movement of the microtome head, for example by providing a spring loaded collar on rotatable shaft. In a further aspect a cryostat is provided with a touch screen display. |
